Remove roast from oven; place on platter and wrap tightly in aluminum foil. Allow to stand 15 minutes (IMPORTANT! Meat will continue to cook during standing time; do NOT omit this step!).

To make gravy, pour meat juices from roasting rack into saucepan.

Using broth or potato water, rinse roasting rack into saucepan, scraping to remove browned bits. Add broth or potato water until the liquid in the saucepan equals 2 cups. Bring to boil; thicken with mixture of cornstarch and water. Season to taste.